What are good color schemes for coloring rules?

Just curious how other members of the community come up with effective coloring filters. I've been trying to create more profiles for all the different services that I troubleshoot. As such I've been starting to branch out and starting to add more color filters. As funny as it might sound, the hardest part is to decide which colors I should use.

Even something as simple as DHCP it's taken me ages to tweak. For DORA packets I generally want them to be the same color scheme. But then I want releases, informs and NAKs to all stand out a bit more. But most of the time it just tends to clash and ends up being more of a distraction.

Do other community members have any recommendations for how they decide to color their packets?